There are several reasons: the main reason is that the phenomenon of the car not being able to start is not clearly described, is it a regular phenomenon or is it just not starting NOW.
1. Ask the user: the time the fault occurred, the phenomenon, the situation at that time, the cause of the fault and whether it has been repaired, dismantled, etc.
2. Determine the extent and location of the defect in advance.
3. Call the fault code and find out the contents of the fault.
4. Perform maintenance based on the fault range displayed by the error code, paying particular attention to whether connectors are loose or falling off and whether wires are properly connected.
5. After the maintenance is completed, it should be checked whether the fault has been eliminated.
6. If the error code cannot be retrieved or the error content cannot be found afterrecovery, approximately determine the extent of the error according to the error phenomenon, and use the method of checking the working performance of the components one by one to eliminate it.
2. Diagnosis of common faults
1. The engine cannot start or is difficult to start
(1) The starter does not turn or turns slowly
a) Check the battery voltage.
b) Check whether the battery poles, wire connections, etc. are correctly connected. are loose.
c) Check the starting system, including the ignition switch, starter switch, neutral start switch and starter, and whether the wiring of each part is loosely connected.
(2) The starter turns normally, but the engine cannot start
a) Call the fault code.
b) Check the working condition of the fuel pump.
c) Check if the idle system is working properly (sIf the idle system is not working properly, the engine may start when the accelerator pedal is depressed).
d) Check the ignition system, including high voltage spark, ignition timing, spark plugs, etc.
e) Check if there is an air leak in the air intake system.
f) Check if the air flow meter or air pressure sensor is malfunctioning.
g) Check if the fuel injector and low temperature start injector are working properly. h) Check the EFI system circuit, including the relevant ECU connector terminals. i) Check if the mechanical part is defective.
Hello car owner! Great Wall Fengjun is divided into diesel and gasoline. The gasoline engine stalls while driving, then it can start, but cannot be refueled. This phenomenon is caused by insufficient fuel pressure. It is recommended to check the carb pumpurant and fuel pressure adjustment. valve, then replace the fuel filter element. Diesel motor. If the engine is not a high pressure common rail, it is likely that the secondary pump is damaged and the diesel filter element is dirty. For high pressure common rail models, you. You need to use equipment to further check the car problems and ask an auto expert. Professional technicians from 4S stores can solve the problem within 10 minutes.